Can't hide apps from Family Sharing

I'm trying to hide a couple of apps from Family Sharing, but they won't stay hidden - I select 'hide' on my iPad and they disappear, but then reappear and are still visible to all on Family Sharing. Does anyone know why this is happening and what I can do about it? Thank you 🙂

(I've tried using iTunes on my PC to hide them, but for some reason that won't even let me login to my account - I get an error message saying to check my internet connection, but there's no problem with Internet access, so hiding them on there isn't an option).